Hypolimnion

Hypolimnion

The hypolimnion is the dense, bottom layer of water in a thermally-stratified lake. It is the layer that lies below the thermocline.

Typically the hypolimnion is the coldest layer of a lake in summer, and the warmest layer during winter. Being at depth, it is isolated from surface wind-mixing during summer, and usually receives insufficient irradiance (light) for photosynthesis to occur.

In deep, temperate lakes, the bottom-most waters of the hypolimnion are typically close to 4°C throughout the year. The hypolimnion may be much warmer in lakes at warmer latitudes.

The word "hypolimnion" is one of the longest words that can be typed with only the right hand on a QWERTY and AZERTY keyboard.

ee also

*Epilimnion

External links

*http://wow.nrri.umn.edu/wow/teacher/thermal/teaching.html


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  • hypolimnion — ☆ hypolimnion [hī΄pōlim′nē än΄, hī΄pō lim′nēən ] n. [ModL < HYPO + Gr limnion, dim. of limnē, a pool of standing water] an unfrozen lake s cold, lowermost, stagnant layer of oxygen poor water that is below the thermocline: see EPILIMNION …   English World dictionary

  • Hypolimnion — Gliederung des Sees aufgrund abiotischer Faktoren Das Hypolimnion (Hypolimnial) ist die untere, nur durch interne Wellen und deren Ausgleichsströmungen bewegte und bei 3,98 °C homogen kalte Wasserschicht in einem geschichteten stehenden… …   Deutsch Wikipedia

  • Hypolimnion — hipolimnionas statusas T sritis ekologija ir aplinkotyra apibrėžtis Apatinis didžiąją metų dalį nesimaišantis ežero ar kito vandens telkinio sluoksnis, kurio temperatūra artima didžiausio tankio vandens temperatūrai. atitikmenys: angl.… …   Ekologijos terminų aiškinamasis žodynas

  • hypolimnion — hipolimnionas statusas T sritis ekologija ir aplinkotyra apibrėžtis Apatinis didžiąją metų dalį nesimaišantis ežero ar kito vandens telkinio sluoksnis, kurio temperatūra artima didžiausio tankio vandens temperatūrai. atitikmenys: angl.… …   Ekologijos terminų aiškinamasis žodynas

  • Hypolimnion — L hypolimnion est la couche située sous le métalimnion en dessous de la thermocline. C est la couche thermique la plus profonde d un lac ou d une mer fermée, toujours froide et à température peu variable ; elle est située selon la saison en… …   Wikipédia en Français

  • hypolimnion — noun (plural hypolimnia) Etymology: New Latin, from hypo + Greek limnion, diminutive of limnē lake more at limnetic Date: 1910 the part of a lake below the thermocline made up of water that is stagnant and of essentially uniform temperature… …   New Collegiate Dictionary

  • hypolimnion — the cold lower layer of a stratified lake, under the epilimnion and beginning just below the thermocline. This layer is not directly affected by surface events …   Dictionary of ichthyology

  • hypolimnion — n. [Gr. hypo, under; limne, lake] The bottom stratum in deep lakes containing low oxygen and near absence of living organisms; see epilimnion, thermocline …   Dictionary of invertebrate zoology

  • hypolimnion — hypolimnetic /huy poh lim net ik, hip oh /, hypolimnial, adj. /huy peuh lim nee on , nee euhn, hip euh /, n., pl. hypolimnia / nee euh/. (in certain lakes) the layer of water below the thermocline. [1905 10; HYPO + Gk límn(e) lake + ion dim. n.… …   Universalium

  • hypolimnion — noun The perpetually cold layer of water that lies beneath the thermocline of a thermally stratified lake …   Wiktionary

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